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  • May 2009Slot Tech MagazinePage 4

    Randy Fromm's

    Slot Tech Magazine

    EditorRandy Fromm

    Technical WritersTed Befus, Kevin Noble, Pat

    Porath, James Borg

    Slot Tech Magazine is publishedmonthly bySlot Tech Magazine1944 Falmouth Dr.El Cajon, CA 92020-2827tel.619.593.6131 fax.619.593.6132e-mail editor@slot-techs.comVisit the website at

    SUBSCRIPTIONSDomestic (North America) 1 year - $60.002 years - $120.00International1 year - $120.002 years - $240.00

    Copyright 2009 under the UniversalCopyright Convention. All rights re-served.

    Slot Tech Maga-zine

    May 2009

    Inside Slot Tech Magazine

    Page 4 - EditorialPage 6 - CommandStrips for Touch Sensors from 3MPage 10 - Twist of FatePage 18 - Problems SolvedPage 22 - Quick and Simple Repairs #50Page 26 - Subscriptions and Order Form

    Slot Tech Magazine is anofficial publication of

    Randy Fromm

    Randy Fromm - Publisher

    The Command Strips are here!The Command Strips are here!

    I have been sitting on this report for years now. I am finally, afteryears of being sworn to secrecy, happy to report that 3Ms CommandStrips is are now available in strips that are specifically manufac-tured to mount 3M MicroTouch ClearTek II touch sensors to gamingmonitors. Youve seen advertisements for Command Strips ontelevision. You can use it them to affix a picture hook to the walland hang a heavy, framed painting. When you want to remove it,you simply pull on a tab and the Command Strip releases itself fromthe wall without leaving a mark. Its based on the same technology,just formulated in long strips for touch sensors. Starting NOW, notools will be required to remove and replace a touchscreen whenyou use the Command Strips. Admit it. How many times have younoticed a dirty monitor screen but just didnt want to hassle withremoving the double-sided VHB tape and cleaning off the gummyresidue it leaves behind? Of course, it will take a while to retrofityour entire casino floor but I highly recommend that you order amess of strips right now so you can have them on hand. Believe me,you will never want to see a roll of VHB again once you try this newtechnique.

    Gary Platt Manufacturing, makers of the best casino seating in theworld, have thrown Slot Tech Magazine a bone and have placed anorder to run a few ads with us. Yes, they realize that there is noth-ing electronic to repair in a casino chair. It is a SUPPORT issue.They support Slot Tech Magazine and what were trying to accom-plish. I am begging you, when you are considering replacementseating for your casino, please consider Gary Platt Manufacturingand please mention that you saw their ad in Slot Tech Magazine.

    We have another new friend in Endicott Research Group, a manu-facturer of inverters for LCD monitors. I am working with them toput together a line of universal replacement inverters for all of themonitors we use in gaming. As much as I enjoy component levelrepair, backlight inverters are cheap and it generally isnt practicalto repair them. We didnt have a chance to finish the project for thismonth but look to ERG to provide us with a guide to their completeline of replacement inverters in the near future.

    Thats all for this month. See you at TechFest!

  • Slot Tech MagazineMay 2009 Page 5

  • May 2009Slot Tech MagazinePage 6

    Slot Tech Feature Article

    Slot machinemaintenance is nowalk in the park, justask any slot technician.And as a group they wouldprobably say that theirleast favorite task isremoving a damaged touchsensor or a sensor from abroken display. Whether itis slicing through the VHBtape to remove the sensoror cleaning up the stickyadhesive residue beforeapplying another strip ofVHB to mount the sensor,it is slow going, messy and

    they know there has to be abetter wayand there is,Command Strips for TouchSensors from 3M.

    Double-sided VHB tape isthe industrys preferredadhesive for mountingtouch sensors to gamingdisplays due to itsunsurpassed holding powerin preventing sensormovement duringprolonged player use andover long periods of time.Its aggressive bondingcharacteristics secure the

    touch sensor to the displayhousing so tightly that itcreates a nearlyunbreakable bond. VHBtape is a product that doesits job well, sometimes toowell if you have to replacethe touch sensor.

    As happens on the 24/7,semi-unattendedenvironment of the casinofloor players can damagethe touch sensor or a LCDcan malfunction, whichrequires slot techs toreplace one or the other. In

    The New Las Vegas StripCommandStrips for Touch Sensors from 3M

  • Slot Tech MagazineMay 2009 Page 7

  • May 2009Slot Tech MagazinePage 8

    either case, the touchsensor must come off andthat can be a timeconsuming and difficulttask.

    Every slot tech has his orher own method forremoving the touch sensor.Some slice the VHB andpry off the sensor; othersprefer to pull wire throughthe VHB to separate thesensor. In both cases, it istime consuming, difficultwork.

    As a leading manufacturerof touch sensors for thegaming industry, 3M TouchSystems has worked withslot technicians for manyyears to help train them ineffective touch sensorintegration and procedures.Time and time again, weheard that removing andreintegrating the touchsensor is their mostburdensome task and amore efficient methodwould make a big differencein their jobs and 3Mlistens.

    IntroducingCommandStrips forTouch Sensors from 3M, anew and unique method forquick removal and easyintegration of touchsensors. Based onCommands patentedstretch release adhesivetechnology made popular inhome and office hang andremove applications, thesepeel and stick strips offera cost-effective and time-saving solution to the

    existing VHB integrationmethod.

    Once a touch sensor ismounted, by pulling theCommand Strips tab itstakes only seconds toremove a damaged touchsensor or the workingsensor from the damageddisplay, and then using theself-adhesive foam strips ittakes only minutes toreintegrate it. Compared totodays 45-60 minuteindustry average forremoving and integrating atouch sensor, thats timeand money saved.

    To really appreciate theease of using CommandStrips for Touch Sensorsyou need to try them. Youllfind there are no toolsrequired, no adhesive

    residue to clean, and nopossible damage to thetouch screen or display.

    To get a Command StripsSample Kit (enough stripsto mount a 20 touchsensor), either contact yourparts distributor, call 3M at888-659-1080, or registerat

    Note: Command Strips forTouch Sensors weredeveloped for use with the3MMicroTouchSystemSCT3250EX (formerly,3MMicroTouchClearTekIISystem). Customers mustdetermine whetherCommand Strips aresuitable for use with theirparticular touch sensor andin their intendedapplication. - STM

    New Feature (if you want it)!Lets try some free classified ads for casinos and slottechs. This can be for almost anything you want to getrid of (hoppers, CRT monitors, old conversions, etc.).


    Maybe its something that youre looking for. Need anold slot glass? Maybe someone has what youre lookingfor. You can advertise for just about anything EXCEPThelp wanted. I will not accept ads that seek to hire a slottech. I WILL accept an ad from a slot tech thats look-ing for a job, however. If you are in the unenviableposition of being laid off, I will be happy to publish anad for you.

    Well see how it goes.


  • Slot Tech MagazineMay 2009 Page 9

  • May 2009Slot Tech MagazinePage 10

    Slot Tech Feature Article

    I had noticed that thescreen on one of the IGTmachines had becomesomewhat large horizon-tally for quite a few days,but since I was partiallyrushed off my feet andwasnt quite sure how totackle this monitor, I sort oflet it be as it was. It was stillin operation which was thebottom line and I had moreurgent matters to see to,like a completely FUBARmachine for instance. Themonitor showed a margin ofpincushion effect on it butnot too bad. However,things on it had gone frombad to worse after some

    work had been done on themachine and it ended upgoing all green. To makematters worse, the touchscreen wasnt respondingas desired either so it wastime to put my thinking capon at roll up my sleeves.

    I decided to start off withthe easy job first. Thats thecolor problem. On lookingat the screen I could seethat most of it was reallygreen, there was also someblue visible but no red at allto be seen, nowhere. Acharging bull on the war-path would completelyignore it without even rais-ing an eyebrow.

    Just for a kick, I hit thescreen to see if something

    would happen and some-thing did happen. Actuallythree things happened.One was that I got a funnylook from a client sat closeby, the second was that Ihurt my hand and the thirdwas that for just a briefmoment, there was a flashof red. I hit it again andanother red flash appearedand disappeared again.Good. Very good. Just a dryjoint.

    Why is it that most techni-cians I know (including theundersigned) jump to con-clusions? I knew that thiskind of fault shouldnt betoo much of a challenge tosink my teeth into but itshould set me off in highspirits for the real fault at

    Twist of FateBy James Borg

    Figure 1 (l) and figure 2 (r) - This is the Amp Metrimate connector used to connect the monitor to therest of the slot machine. In addition to the AC power for the monitor, the connector also carries thered, green and blue color signals (video) and the sync signals.

  • Slot Tech MagazineMay 2009 Page 11

    hand, namely the horizon-tal size. With that verypositive thought in mind, Ipulled the monitor out ofthe machine and startedthe trip to the workshop.

    The monitor is a Ceronixmodel 1793. It was one ofthose units with little mod-ules (called PRAs whichstands for precision resis-tor array but in fact theycontain other componentsas well) soldered verticallyon to the CRT neck boardmaking up each individualcolor stage. I didnt want tothink about the negativeaspect of this since I verymuch doubt if I had anynew PRAs in the spares inthe workshop. If the worsewas to come to the worst, Iwould have had to pull outa similar one from a FUBARmonitor and hope that theone I pulled out wasntFUBAR itself which wouldcomplicate matters some-what.

    Editors Note: There is nocompany I know of that cantop Ceronix when it comes toobtaining replacements.Service is fast and ex-tremely friendly. Ceronixreplacement parts are dirtcheap. You can order any-thing you want from theirwebsite at ThePRAs are especially light-weight and can be sent byAir Express anywhere in theworld at a very cheap cost.

    Cutting the cable ties offfrom the CRT board toexpose the print and theconnections for a good

    inspection didnt offer anydecent conclusions as Icouldnt see anythingwrong. I got my trusty mag-nifying glass out andscanned each and everysolder joint for a possibledry or fractured connection.The result was very disap-pointing. I was really hop-ing to find that elusive drysolder joint as otherwisethe thought of going intodetailed fault findingseemed quite daunting atthe time. The fact that theelectronics on these moni-tors is quite complex to saythe least, doesnt help thesituation at all. Reasonbeing that this was sup-posed to be after all aquickie, a morale booster,the calm before the stormperhaps? A fault which isnt

    a quickie I can handlesince I get mentally tunedfor it from the very startand wont leave a stoneunturned till I manage tolocate the fault. With noth-ing to lose, I still freshlyspotted some areas just forthe sake of using the sol-dering iron since I hadturned the heat on. No dryjoints there meant that thefault wasnt a dry joint.Hows that for logic? Itcould be the case that theCRT socket was dirty, devel-oped an oxide, or was per-haps slightly out of place soI pulled the whole neckboard out from the tubeand sprayed some contactcleaner into it and pressedit firmly back. I mustnt alsoignore the fact that the CRTcould be (Shock and some

  • May 2009Slot Tech MagazinePage 12

    horror pitched in!) faultyitself but I didnt want tokill it off just like that. Idont normally kill off a CRTand I only do it once Imperfectly sure that its goneto a point of no return, tomeet its maker in thehappy hunting ground.Apart from all that, its alsoa pain in the nether re-gions to replace.

    It was a good time to go andcheck out the color again sothe trip back to the ma-chine commenced. Thewalk seemed endless some-how. I was lost in thoughtsand not happy at all. I haveto admit that I had badvibes about this. I didnt seethe hoped for bad solderjoint anywhere so thisexercise could in fact proveto be only a complete wasteof time. Pushing the moni-tor all the way home intothe AMP Metrimate socketmaking up the connectionto the outside world was apiece of cake.

    This connection feeds themonitor the supply and theseparate RGB signals andother control lines. Turningon the machine and goingthrough its start up se-quence, different colorsflashed for a while but onlyGREEN and BLUE wereseen. No RED. Ouch! Whata disappointment. Thatmeans the monitors got togo back to the workshopand I would have to pull thecircuit diagram out to seewhats going on. Themanual I have is prettyneat, complicated to say the

    least, but neat. My moralesort of hit the deck when Istarting flicking throughthe video section.

    A quick look at the Trouble-shooting section wouldntgo amiss and low and be-hold, there was a sectionwhere Missing Color wasdiscussed in depth. It wentinto great detail specifyingvoltages and test points andmeasurements and K-Filmand it made an interestingread. However, none of thathelped me a great deal as Icouldnt find anythingwrong with the monitor.Something was definitelywrong as one of my colorswas definitely missing butwhat?

    I didnt have a suitablesignal to feed the monitorwith in the workshop sothat was a bit of a disadvan-tage really. Out of purechance, I happened to look

    at the front of the screenand there was a faint whiteraster. White? Did I justsee white? Just hold yourhorses for a few moments.If its white then how comethere isnt any RED colorshowing from the game? Awhite raster means that allthe three guns are workingproperly along with most ofthe video circuitry. This ledme to believe that therecould something externalto the monitor that wasupsetting the output to thescreen. Just to make surethat I was not going to starton a wild goose chase, Iinjected a low pulsatingvoltage just before the colordrivers individually. Trueenough, all the three colorsshowed on the screen. Ihad to sigh as that was aload off my mind. Also, thatproved the CRT was fine. Iwas pretty sure that thetube was not the culpritbut having said that, any-

    Figure 3 - The monitor connection to the backplane

  • Slot Tech MagazineMay 2009 Page 13

    TechFest 19May 12-14 2009Mystic Lake Casino HotelPrior Lake (Minneapolis) MNIt used to be that casinos could throw money at aproblem and make it go away. Now more than ever,you cant afford to depend on others for your repairsand you cant afford costly mistakes.

    Please consider attending TechFest 19 forthe latest technical information on slot ma-chine repair.

    Note: There is another magazine out there promotinganother fest with an almo...